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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Old 09-03-2013
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Extreme Exhaust Elbow Heat

I have a Universal (Kubota) 5432 that runs well and seems to operating well with one exception.

The issue: when under power at anything over 1700 rpm the exhaust elbow gets so hot it starts to smell terribly and at one point it got hot enough to cause the muffler/header wrap to smolder and smoke. It was scary hot so I backed down and motored at low rpm and the heat dissipated. The high heat condition occurs when the thermostat is in the 160 range so there is no way the kubota can get close to ideal operating temp and it does not appear to be over-heating. Maybe the sensor is not catching the overheat condition due to location and it is heat transfer or flow in HX.

I have not replaced the heat exchanger (it is 3" sen-dure) but put on new end caps and zinc (zinc was gone); pumped out muffler in the event of build-up and sucked all hoses out with shop vac in the event of blockage and/or back pressure. I have not pulled elbow off the manifold and cleaned out but the RW entry connection is clear.

Anyone ever have this condition? Thanks for any input.
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Old 09-03-2013
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Re: Extreme Exhaust Elbow Heat

The raw water injection nozzle may be significantly blocked, preventing sufficient water flow through the mixing elbow to cool the exhaust. If so, the flow of raw water through the engine will be restricted, allowing the engine to heat up, making the exhaust even hotter and round-n-round it goes. Pull the injection nozzle and ensure that it's interior is clear and reasonably smooth.
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Old 09-03-2013
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Re: Extreme Exhaust Elbow Heat

Great feedback. I will check that and thanks.
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